Nerve
Videos
A nerve is an enclosed, cable-like bundle of nerve fibers. Nerves have historically been considered the basic units of the peripheral nervous system. A nerve provides a common pathway for the electroc
Cross-section of a nerve
Micrograph demonstrating perineural invasion of prostate cancer. H&E stain.
Nervous system
Videos
In biology, the nervous system is the highly complex part of an animal that coordinates its actions and sensory information by transmitting signals to and from different parts of its body. The nervous
Nerve
…travel from one neuron to another by crossing a synapse, where the message is converted from electrical to chemical and then back to electrical. The nervous system is the part of an animal that coordinates its actions by transmitting signals to and from different parts of its body. In vertebrates it consists of…
Horizontal section of the head of an adult female human, showing skin, skull, and brain with gray matter (brown in this image) and underlying white matter
Major elements in synaptic transmission. An electrochemical wave called an action potential travels along the axon of a neuron. When the wave reaches a synapse, it provokes release of a small amount of neurotransmitter molecules, which bind to chemical receptor molecules in the membrane of the target cell.
Illustration of pain pathway, from René Descartes's Treatise of Man
Layers protecting the brain and spinal cord